1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 108Get this manual

1992-2000 Mercury Mariner 105-225HP outboards Factory Service Manual, Page 108

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PRIMARY PICKUP TIMING ADJUSTMENT 1 With engine in neutral, hold throttle arm so that
Engine idle RPM must NEVER EXCEED 750 RPM in gear3 With end of throttle cable connected to throttle